Abstract Solubilities of ternary system (KCl-SrCl2-H2O) were determined using the isothermal dissolution equilibrium method at 273 and 308 K. According to the obtained experimental results, the phase diagrams of the system at 273 and 308 K were potted respectively. The results show that the ternary system has a invariant point, two univariate solubility curves and two crystallization regions corresponding to KCl and SrCl2•6H2O at 273 and 308 K, no solid solution was found in the phase diagram. Based on Pitzer and H-W model, the Pitzer single salt parameters of KCl (β(0), β(1), Cϕ) and SrCl2 (β(0), β(1), β(2), Cϕ) and the interaction parameters of mixed ions (θK, Sr, ΨK, Sr, Cl) were used to calculate the solubilities of the ternary system at 273 and 308 K, and the results show that the calculated values agree well with the experimental values in this work.

中文翻译：

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三元系统 (KCl-SrCl2-H2O) 在 273 和 308 K 中固液平衡的测量和预测

摘要 采用等温溶解平衡法在273和308 K下测定了三元体系(KCl-SrCl2-H2O)的溶解度。根据所得实验结果，分别绘制了体系在273和308 K下的相图。结果表明，该三元体系在273和308 K具有一个不变点，两条单变量溶解度曲线和两个对应于KCl和SrCl2•6H2O的结晶区，相图中未发现固溶体。基于 Pitzer 和 HW 模型，KCl (β(0), β(1), Cϕ) 和 SrCl2 (β(0), β(1), β(2), Cϕ) 的 Pitzer 单盐参数及其相互作用混合离子的参数（θK、Sr、ΨK、Sr、Cl）用于计算三元系统在 273 和 308 K 下的溶解度，